I believe it’s emulating behavior from reality TV shows such as ‘The Kardashians’. It was done there to not block the face when filming, and for the mics to pick it up.
in reply to:
What is it with people who hold their phones in front of them like a walkie-talkie, rather than holding it up to their ears like a phone? Listening to one side of a strangers conversation is bad enough. I don’t want to hear both.
— Andy Budd (@andybudd) March 13, 2018